• centre line: line in the middle between the maximum and minimum
• amplitude: vertical distance between the centre line and the maximum, or the centre line and the minimum
• period: horizontal distance between two repeated points (corresponding points)
  

Graphing the Sine Function

• represents the y-value of a point on the unit circle

Graphing the Cosine Function

• represents the x-value of a point on the unit circle

Graphing the Tangent Function